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Quality Assurance Plan

Stainless Steel Seamless & Welded Pipes / Tubes – Process Inspection Plan: incoming raw material, stage-wise inspection, testing, traceability, packing & delivery.

A. Incoming Raw Material

Sr. No. Process Description Ref. Documents / Standards Characteristic to be Checked Sampling / Inspection Frequency Instrument / Equipment Used for Testing Acceptance Criteria
1 S.S. Coils / Seamless Pipe (Mother Hollow) Purchase Order / Specification • Dimensions
• T.C. Verification (Lab Test Report), if required
• Packing Condition
• Weight
• Defects, if any 		Sample / Heat Vernier Caliper, Micrometer, Chemical Analysis, Tensile Testing Machine, Brinell / Rockwell Hardness Testing Machine Conform to Specification – 100%

B. Stage-wise Inspection

Sr. No. Process Description Ref. Documents / Standards Characteristic to be Checked Sampling / Inspection Frequency Instrument / Equipment Used for Testing Acceptance Criteria
2 I. Welded Tube Forming & Welding
II. Seamless Cold Drawing 		As per Work Order / Specification Dimensional check: Diameter (Ovality) x Length x Thickness
• Weight
• Defects, if any 		3 Samples from each Coil
1 Sample from each Lot 		Universal Testing Machine UIN 40-T, Make “UTS”; Microscope, Vernier Caliper, Micrometer & Measuring Tape Dimensions acceptable as per order
Conform to standard / approved samples as per details
3 Annealing Temperature as per ASTM Standard • Temperature
• Hardness
• Cooling
• Water Quenching 		1 Sample per Lot / 1 Sample per Heat Digital Graphic Temperature Recorder, Digital Temperature Indicator & Temperature Controller, Metallurgical Microscope, Brinell / Rockwell Hardness Tester  
4 Straightening Straightening as per Specification Check straightness of Pipes & Tubes First 2 Pipes of each Size / Lot Roller Straightening Machine, Micrometer, Visual Observation Straightening as per Specification / Standard Sample
5 End Facing, Squaring & Beveling Burr-Free Squaring / Beveling with Proper V-Shape 100% Visual Inspection Abrasive Polishing as per Standard Sample Conform to Specification / Requirement Straightening as per Specification
6 Hydrostatic Testing As per ASTM Standard Leakage 100% Hydraulic Pressure Tester No Leakage
7 Pickling As per applicable ASTM Standard / Requirement • Scale removal from inside surface
• Scale removal from outside surface 		100% Visual Observation Conform to Requirement
8 Final Inspection – Physical / Chemical Testing As per Applicable Standard Visual, Dimensional, Physical & Chemical 100% or as per ASTM Standard Micrometer, Vernier Caliper, Universal Testing Machine, Moly Detector & Carbon Sampling at Random, Spectro / Wet Method Conform to Requirement
9 Marking as per Customer Requirement / Standard As per Requirement • Spelling Check
• Details Verification 		100% – Confirm on first two Samples & continue Inkjet Machine / Electro-Etching; correlation of Heat No., Size, Grade, etc. with Test Certificate Conform to Requirement
10 Packing & Delivery As per Customer Requirement Packing Quality / Tightness of Packing 100% – Conform to Requirement and release for delivery Box / Crate, Polythene, Hessian Cloth Packing conforms to Customer Requirement
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